摘要
采用粒子图像测速技术和计算流体力学方法对空调器室外机上下并联轴流风机系统的气动和声学特性进行研究。研究发现,上下并联轴流风机系统的离散频率噪声的基频和高次谐波频率均不等于任何一个单体叶轮的基频及其高次谐波分量,而是正比于上下叶轮频率差的整数倍。上下叶轮间的流场干涉对于总声压级和噪声频谱特性均无明显影响。采用基于CFD的叶片尾缘涡脱落噪声预测方法计算的总声压级误差小于3dBA,可满足工程应用要求。
Both aerodynamic and aeroacoustic performance of collateral axial flow fan system inside outdoor unit of air-conditioner is investigated by particle imaging velocimetry measurement and CFD simulation. The discrete noise frequency is not equal to the upside blade passing frequency, nor the downside rotor, but equal to the integral times of BPF differences between upside and downside rotors. No obvious flow field interaction has been found between upside and downside rotor. Vortex shedding noise prediction model is proved to be effective, with predicted total sound pressure level error less than 3 dBA.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2007年第10期215-220,226,共7页
Journal of Mechanical Engineering
基金
上海交通大学-日本大金空调株式会杜合作研究资助项目。
关键词
气动噪声
空调器
轴流风机
粒子图像测速
Aerodynamic noise Air-conditioner Axial flow fan Particle imaging velocimetry
